One of Sheldon's GPS trivia questions is what four state capitols are not served by the Interstate Highway System. There are five capitols: Juneau (AK), Carson City (NV), Dover (DE), Jefferson City (MO), and Pierre (SD).
This episode's end titles have Chuck Lorre's Vanity Card #404.
Original International Air Dates:
Canada: January 10, 2013 on CTV
Finland: December 19, 2013 on Sub
The boys are all dressed as characters from Star Trek: The Next Generation. Howard is dressed as an evil member of the Borg, Raj as the Klingon security chief Lt. Worf, Leonard as the intrepid Capt. Jean-Luc Picard, and Sheldon as the android Lt. Commander Data.